#1 Home Improvement Retailer

Internet # 321098918

Model # WTS301

Product Images

Best Seller

Smart Indoor Water Sensor, Wi-Fi Connected, Wireless (Battery) - White (1-Pack)

$19.99
  • Alerts you whenever it comes into contact with fluid
  • Pre-Installed with batteries and adhesive
  • View More Details

Free & Easy Returns In Store

Return this item within 90 days of purchase.

Read Return Policy

Ask about this product

Get an answer now with AI

Magic Apron Assistant is an AI virtual assistant. By proceeding, you consent to the recording and use of your information by The Home Depot (and authorized third parties). More information

Product Details

About This Product

The SimpliSafe Water Sensor sounds the alarm whenever it comes into contact with water. Place it near common household water sources like a dishwasher, hot water heater or washing machine. With professional monitoring, we are notified and will alert you if your home is in danger.

Highlights

  • Be notified of possible home flooding with this SimpliSafe water sensor
  • Alerts you whenever it comes into contact with fluid with an audible alert
  • Place in areas where flooding or water damage may occur
  • Ready to work right out of the box, your water sensor comes pre-installed with batteries and adhesive
  • Compatible with your SimpliSafe gen 3 home security system
  • Setup is a snap, place it in the area you want to monitor and add device with your SimpliSafe keypad
  • Add up to 100 sensors to the base of your SimpliSafe home security system latest generation
  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Product Information

Internet # 321098918

Model # WTS301

Additional Resources

Shop All SimpliSafe
From the Manufacturer

Specifications

Dimensions: H 2.4 in, W 1.4 in, D 2.4 in

Dimensions

Product Depth (in.)

2.4 in

Product Height (in.)

2.4 in

Product Width (in.)

1.4 in

Details

Battery Size

CR2032

Features

Audio Alert/Siren

Hub Required

No hub connection available

Included

Batteries

Indoor/Outdoor

Indoor

Number of Sensors Included

1

Pack Size

1

Power Options

Battery

Range (ft.)

1000 ft

Remote Access

Remote Access

Requires Hub?

Requires Smart Hub

Returnable

90-Day

Sensor Location

Water Leak

Smart Home

Smart Home Enabled

Smart Home Protocol

Wi-Fi

Voice Control Hub Required

Voice Control via Proprietary App

Works With

Alexa, Google Assistant

Warranty / Certifications

Manufacturer Warranty

1 Year

Questions & Answers

Soooo this is a motion sensor too? Your description says it has one, but I’m suspicious. Ty
ByJan 6, 2026
1 Answer | 
Answer This Question

No this is not a motion sensor. It is a water sensor only. You sit it on the floor or in a cabinet under a sink. When it comes in contact with water you get an alert on the base station as well as an alert on your phone.

By|Mar 16, 2026


    why does this product description identify a motion sensor when we want a water sensor?
    BySep 17, 2025
    0 Answer | 
    Answer This Question

    Why does the product description talk about motion sensor when this is a water sensor?
    ByJul 6, 2025
    0 Answer | 
    Answer This Question

    Why is the product information on this page for a different product than what is being sold? The page is for a water leak detector, while the product information is for a motion detector.
    ByApr 15, 2024
    2 Answers | 
    Answer This Question

    Has not been changed.

    By|Oct 5, 2025

      Thank you for your feedback. The product description has now been corrected.

      By|Jul 6, 2025

        (1)

        You need to identify the Generation this belongs to. 2? 3? It makes a big difference.
        ByNov 21, 2023
        1 Answer | 
        Answer This Question

        Hi, yes, this is the Water Sensor for the Gen 3 (current gen) SimpliSafe system. We no longer have the Original Water Sensor available with our retail partners.

        By|Dec 6, 2023


          I purchased the SimpliSafe Water Sensor which is supposed to be Wi-Fi enabled. I was expecting to have to download an App in order to register the product and then set up notifications etc. Does this product require the Keypad to work?
          ByAug 17, 2023
          2 Answers | 
          Answer This Question

          So sorry for the confusion. This Water Sensor is a component add-on for a full SimpliSafe system, and is not able to function as a standalone unit. You'll need at least a Base Station and a Keypad for it to function.

          By|Jun 28, 2026

            (4)

            This is not a standalone device. You need a simply safe alarm in order to use this. The alarm has to be the new version. This device does not work with the old 1st generation Simply Safe alarm.

            By|Mar 16, 2026


              What type of battery does it use, how long does the battery last, is the battery able to be changed or do you need a new device? Thank you, B Cronin
              ByAug 12, 2023
              1 Answer | 
              Answer This Question

              the Water Sensor uses a CR2032 battery, which should last about 3-5 years.

              By|Mar 20, 2026

                (3)

                Will this work with Resido app?
                ByApr 24, 2023
                1 Answer | 
                Answer This Question

                At this time we do not offer integration with that ecosystem.

                By|May 2, 2023


                  Viewing 1-8 of 10

                  Customer Reviews

                  4.4 out of 5

                  • 4.4 out of 94 reviews
                  • 86% recommend this product
                  Filter by:
                  Showing 1-10 of 94 reviews
                  So far so good. I had to delete and reconnect, but the device was easy to add to my system. It gives us piece of mind when leaving home knowing if water is detected, we will be notified. We place under the toilet tank.
                  by
                  We have Simplisafe security system so I decided to try out these water sensors after our sump pump float stuck and caused water on the floor of the laundry area. I also put a sensor by the hot water tank too. They were easy to setup no issues there. Its been 3 weeks so far and no alarms because the pump has been working correctly. I did test with the water spray and they triggered.
                  by
                  Easy to connect to the simplisafe app. I like to be able to connect notifications that way. Works when it sense water underneath it.
                  by
                  This water sensor was easy to setup and toss it exactly where it's needed. I tested it out by just putting it in a shallow bowl of water and it triggered the alarm.
                  by
                  Saved my laundry room
                  Accurately alerted me to a leaking washing machine in my second floor laundry room. Saved $$$ on a possible flood situation. For those talking about inaccurate product description, yes it does need the Simplisafe base unit in order to work. Also, it says “requires smart hub” under product details.
                  by
                    • Recommended
                    1 found this review helpful
                    I added this device to watch over my basement and sump pump. It gives me peace of mind knowing it is actively monitored with my existing Simplisafe system.
                    by
                    • Verified Purchase
                    This customer chose to rate the product and not provide text.
                    by
                    • Verified Purchase
                    I returned it, it is not stand alone you need a complete system and this is just one component. :(
                    by
                    This customer chose to rate the product and not provide text.
                    by
                    • Verified Purchase
                    No assembly needed. It worked! Alarm was was loud and clear. ?
                    by
                    Showing 1-10 of 94 reviews